1 files changed, 20 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs b/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs
index d547e771d7..2699912ea1 100644
--- a/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs
+++ b/src/mscorlib/shared/System/IO/UnmanagedMemoryStreamWrapper.cs
@@ -114,6 +114,11 @@ namespace System.IO
             return _unmanagedStream.Read(buffer, offset, count);
         }
 
+        public override int Read(Span<byte> destination)
+        {
+            return _unmanagedStream.Read(destination);
+        }
+
         public override int ReadByte()
         {
             return _unmanagedStream.ReadByte();
@@ -136,6 +141,11 @@ namespace System.IO
             _unmanagedStream.Write(buffer, offset, count);
         }
 
+        public override void Write(ReadOnlySpan<byte> source)
+        {
+            _unmanagedStream.Write(source);
+        }
+
         public override void WriteByte(byte value)
         {
             _unmanagedStream.WriteByte(value);
@@ -200,11 +210,21 @@ namespace System.IO
             return _unmanagedStream.ReadAsync(buffer, offset, count, cancellationToken);
         }
 
+        public override ValueTask<int> ReadAsync(Memory<byte> destination, CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return _unmanagedStream.ReadAsync(destination, cancellationToken);
+        }
+
 
         public override Task WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
         {
             return _unmanagedStream.WriteAsync(buffer, offset, count, cancellationToken);
         }
+
+        public override Task WriteAsync(ReadOnlyMemory<byte> source, CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return _unmanagedStream.WriteAsync(source, cancellationToken);
+        }
     }  // class UnmanagedMemoryStreamWrapper
 }  // namespace